I came across this cool little trick that's very simple. You create a script and it will say whatever you type on a loop (repeat). There's another one below that will make your keyboard flash all crazy. If you know how to bind files you can bind it to a .jpg and play a trick on someone. They open the image, they're keyboard is flashing and their computer is talking to them at the same time.

To kill either process go into your task manager and end process wscript.exe